4th Child.....boy and girl.... -TON Names

We are expecting our 4th child. We have not found out the gender. All of our Child's names bed in -ton. We have 2 boys and a girl We like Surnames. For a boy it has to be strong, but for a girl we would like to be able to shorten it into a cute nickname. Our sons names are Ashton and Kolton. Our daughters name is Luxton. We are looking for something a little different....edgy. Maybe a name that we just add -ton onto.....any ideas would really help! Thank you! :-)